Willcox is located at 32°15'8" North, 109°49'53" West (32.252500, -109.831389).

According to the United States Census Bureau, the city has a total area of 6.11 mi2 (15.84 km2). 6.00 mi2 (15.54 km2) of it is land and 0.12 mi2 (0.30 km2) of it is covered by water. The total area is 1.89% water.

Willcox is located in the Mountain Standard Time (MST) timezone, GMT-07:00.